main()
{
    int n, a, i;
    printf("The series with equal difference are : \n");
    for (n=1; n<=6; n++)
      for (a=1; a<=4; a++)
        if (4*n+6*a==26 && n*(n+a) * (n+a+a) * (n+a+a+a)==880)

          for (i=0; i<20; i++)
            printf(" %d", n+i*a); 
}